Abstract: An optical system, sequentially comprising from an object side to an image side: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power, both the object side surface and the image side surface of the fourth lens being convex; a fifth lens having negative refractive power, both the object side surface and the image side surface of the fifth lens being concave; and a sixth lens having positive refractive power, both the object side surface and the image side surface of the sixth lens being convex. The optical system satisfies the following relationship: ?47<f45/f<27, wherein f45 represents a combined focal length of the fourth lens and the fifth lens, and f represents an effective focal length of the optical system.

Abstract: An optical structure is characterized by improving a primary lens of a photovoltaic concentrator system. The optical structure is accomplished by properly dividing the primary lens, determining required optical operational regions, and arranging the optical operational regions basing on an identical location into an annular array, thereby forming the complete optical structure. The optical structure facilitates enhancing uniformity of light distribution throughout the optical operational regions, improving photoelectric conversion efficiency of a solar cell having the optical structure, and reducing operational distance between the primary lens and the solar cell.

Abstract: The present invention discloses a compact camera module (CCM) package structure that allows a lens module to adjoin directly on the CCM module to prevent height error that occurs when CCM module is soldered to the substrate from affecting the imaging performance of chip module. The CCM package structure comprises a substrate, a sensor chip module and a lens module. The lens module can encase and cover the sensor chip module, and adjoin the periphery of a light transmitting plane of the sensor chip module through a concave step disposed in the lens module so that the lens module can synchronously maintain the same horizontal angle and height as the light-transmitting plane of sensor chip module, thereby reducing error occurred in the manufacturing process and allowing the lens module and the sensor chip module to produce better focusing and image quality.